Guest User
I have a ribbed metal roof installed over plywood decking on 2x4 trusses. The roof has vented soffits and a ridge vent. I would like to install insulation on the roof but with 3 1/2" wood and 3 1/2" insulation there will not be a space for air flow. Will the ribbing in the metal roof suffice for ventilation and keep down moisture buildup? Thanks, Nelson
Todd Miller
Isaiah Industries, Inc.
No. According to code, roof assemblies need a minimum 1" vented space.
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